Flight segment
One platform, one shield, six instruments. Everything that is not needed to look at the Sun was removed during phase B.
Platform
Built around a carbon-fibre central cylinder, qualified for eleven years in the interplanetary radiation environment.
Payload
Three remote-sensing instruments that look at the Sun, three in-situ instruments that measure what reaches the spacecraft.
Field of view 1.5 to 15 solar radii, cadence 5 minutes, externally occulted with a three-disc system machined to 8 micrometres.
Full-disc photospheric magnetic field at 1 arcsecond, delivering far-side maps every twelve minutes.
Six emission lines from 17 to 63 nanometres, tracking plasma temperature and Doppler velocity in the low corona.
Ion and electron distributions from 5 eV to 30 keV, sampled every 4 seconds during storm mode.
Two sensors on a 4.2 metre boom, 0.01 nanotesla resolution, the reference for every arrival-time model.
Protons and heavy ions to 200 MeV per nucleon, the first alarm for radiation risk on polar flight routes.
Assembly
The occulting discs were turned on a diamond lathe in Neuchâtel and measured under interferometry in a hall held to 20.0 °C. A deviation of ten micrometres would have scattered enough sunlight to bury the corona.
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